In the book's own words, not ours, with obvious scanning errors fixed. Families often supplied these stories to the publisher, so check key dates.
Born 1802
From The history of Montgomery county, Ohio, containing a history of the county; (1882)
FREDERICK THOMAS, farmer, Germantown P. O., is a native of Maryland, born in Washington County October 21, 1802, and son of Gabriel and Christina (Wolf) Thomas, of that State, the former born in 1769 and dying in 1857. The family came to Ohio in 1804, and here our subject grew up and received his schooling. In 1846, he carried Dinah Hetzler, born May 18, 1807, and in 1850 moved upon his present farm, if 102 acres, two and a half miles south of Germantown. He has been a member of the Jnited Brethren Church since a young man.
As printed in The history of Montgomery county, Ohio, containing a history of the county; (1882). See the original pages. Wording is the original; obvious scanning errors have been corrected, and a few may remain.
Their biographies name Frederick Thomas: William F. Howell (b. 1827)
The printed record stops around 1882. We trace your line from there down to you, with every source cited.